ES6: Add support for Map.prototype.forEach and Set.prototype.forEach

src/objects-visiting.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 92 matching lines @@
     case JS_SET_TYPE:
       return GetVisitorIdForSize(kVisitStruct,
                                  kVisitStructGeneric,
                                  JSSet::kSize);
 
     case JS_MAP_TYPE:
       return GetVisitorIdForSize(kVisitStruct,
                                  kVisitStructGeneric,
                                  JSMap::kSize);
 
+    case JS_SET_ITERATOR_TYPE:
+      return kVisitJSSetIterator;
+
+    case JS_MAP_ITERATOR_TYPE:
+      return kVisitJSMapIterator;
+
     case JS_WEAK_MAP_TYPE:
       return kVisitJSWeakMap;
 
     case JS_WEAK_SET_TYPE:
       return kVisitJSWeakSet;
 
     case JS_REGEXP_TYPE:
       return kVisitJSRegExp;
 
     case SHARED_FUNCTION_INFO_TYPE:
@@ skipping 359 matching lines @@
 
 
 template Object* VisitWeakList<JSArrayBuffer>(
     Heap* heap, Object* list, WeakObjectRetainer* retainer, bool record_slots);
 
 
 template Object* VisitWeakList<AllocationSite>(
     Heap* heap, Object* list, WeakObjectRetainer* retainer, bool record_slots);
 
 } }  // namespace v8::internal